A comment
Radiators from the manufacturer Kermi, incredibly convenient in installation work, during operation and further use. I chose a panel type Type 22, it has 2 heating panels and two convector fins, a grille on top. In my opinion, this is the best option for price, heat transfer and compactness. The connection itself is quick. The water level in the radiators can be controlled through adjusting taps. This is done simply, but to simplify the task, you can install a thermostat. For maintenance, they actually do not need anything, the only water in the system should be as clean as possible, this can be achieved with special filters, or you can add a reagent.
It is naturally possible to use them if there is a private system. I want to say, I have already accumulated quite good experience in working with many heating radiators, and during all this time I have never encountered the problem of leakage of Kermi radiators. A lot of different models, modifications, and you can pick them up for every taste and color.